JPH021758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refueling device in which refueling information such as the amount of refueling in a refueling machine is processed by a POS terminal.

At a gas station, a refueling machine and a POS terminal are connected, and refueling information such as the amount of refueling by the refueling machine is processed by the POS terminal, or the refueling machine is controlled via the POS terminal.

For this reason, the refueling machine and the POS terminal are usually connected by a pulse line, a grounding wire, and an energizing power supply line, and the refueling machine transmits, for example, flow rate pulses (refueling amount) to the POS terminal via the pulse line. . In this case, in the past, flow rate pulses were simply transmitted from the refueling machine without checking whether the pulses were accurately received by the POS terminal. There was a problem with the control of the refueling machine.

In view of this point, the present invention allows the POS terminal to confirm to the POS terminal that information has been transmitted from the refueling machine to the POS terminal, and if there is an abnormality in the information transmission from the refueling machine, the POS terminal The system sends a notification to the refueling machine so that the refueling machine takes the appropriate action, and the signal is transmitted from the refueling machine to the POS terminal via the existing energizing power supply line. It is.

As mentioned above, the POS terminal and the refueling machine are usually connected by the energizing power supply line, the pulse line, and the ground wire, but according to the present invention, the voltage applied between the power supply line and the ground wire is is configured to be changeable on the post terminal side, and the signal is transmitted by detecting the presence or absence of a change in the voltage on the refueling machine side.

That is, the first aspect of the present invention is to connect the refueling machine and the pos terminal to a power supply line and In the device connected by a pulse transmission line, the pos terminal side includes a power supply circuit that selectively switches and applies voltages of different levels to the power supply line, and a power supply circuit that counts the flow rate pulses and outputs a count for each input flow rate pulse. a counting circuit that generates a signal; and a control circuit that operates in response to each of the counting output signals to generate a switching signal that switches the voltage of the power supply line to a different level and supplies it to the power supply circuit; A voltage determination circuit is provided which determines the presence or absence of an alternating state of the flow rate pulse and a change in the voltage level of the power supply line, and generates an output signal when this alternating state no longer exists. .

In addition, a second invention provides a system that connects the refueling machine and the POS terminal to a power supply line and a power supply line in order to transmit a flow rate pulse generated in the refueling machine according to the amount of refueling to a POS terminal separate from the refueling machine. In the device connected by a pulse transmission line, the POS terminal side includes a power supply circuit that selectively switches and applies voltages of different levels to the power supply line, and a counter that counts the flow rate pulses and corresponds to the number of input flow rate pulses. a counting circuit that generates an output signal;
A preset circuit that presets the desired amount of oil supply;
Comparing the preset oil supply value and the count value of the flow rate pulse, and when the difference between the two values reaches a predetermined value or zero, a control signal is generated to switch the voltage of the power supply line and is applied to the power supply circuit. A voltage determination circuit is provided on the refueling machine side to generate a detection signal when detecting a change in the voltage level of the power supply line.

During refueling, flow pulses corresponding to the measured oil amount are sent from the refueling machine to the pulse counting circuit of the POS terminal via the pulse transmission line, and the pulse counting circuit generates one counting output signal for each received flow pulse. do. 1st
In the invention, the voltage level of the power supply line is changed for each count output signal for a period of time shorter than the period of the flow pulse at the maximum oil supply flow rate. On the fueling machine side,
A voltage determination circuit monitors the occurrence of flow pulses and changes in the voltage level of the feeder. As long as the alternating generation of flow rate pulses and changes in the voltage level of the feeder line exist, the voltage determination circuit determines that the flow rate pulse count is normal and does not generate an output. If the count collapses, it is determined that the count is abnormal and a signal is output, and this determination signal causes necessary control such as stopping the pump motor to be performed.

In the second invention, the count output signal of the pulse counting circuit is compared with a preset value on the post terminal side, and the difference between the count value and the preset value is determined to be a predetermined small value (slightly before the preset value). value) or reaches zero, the voltage level on the power supply line is changed, and the voltage judgment circuit on the refueling machine detects this change in voltage level and outputs a control signal, and this signal controls things such as stopping the pump motor. have them do it.

The illustrated embodiment will be described in detail below.

In Figure 1, OD indicates the refueling machine side and POS indicates the post side. In the refueling machine OD, for example, oil is pumped out from an underground oil storage tank and refueled through the refueling nozzle to the tank to be refueled.In this case, when the refueling nozzle is removed from the nozzle hook on the refueling machine housing, the nozzle detection switch 1 outputs a signal. (nozzle signal) a
As a result, the pump motor M is connected to the power line 3 via the motor control circuit 2 and rotates. When you operate the nozzle to refuel, an electric pulse (for example, 1 pulse per 1/100 liter) is generated according to the amount of oil measured by a flowmeter inserted in the oil supply path.
P is transmitted by the pulse transmitter 4, and this flow rate pulse P
The counting circuit 5 counts the amount of oil supplied and causes the display 6 to sequentially display the amount of refueling. Note that the count value of the counting circuit 5 at the previous refueling (therefore, the refueling amount displayed on the display 6) is returned to zero by the nozzle signal a.

The flow rate pulse P is sent to the POS terminal POS via the pulse transmission line _L1 by the photocoupler 7 and output transistor 8, and is also counted by the counting circuit 10 via the photocoupler 9. L ₂ is the ground line.

Note that the counting circuit 10 returns to zero when the nozzle signal a disappears and the POS terminal POS starts and completes processing of refueling information.

The counting circuit 10 generates one count output signal b every time it receives one flow rate pulse P, gives this signal b to the power supply control circuit 11, and outputs one control signal d for every signal b. let

Reference numeral 12 denotes a power supply circuit that supplies a relatively low voltage (for example, 5V), which constantly supplies drive power to the photocoupler 7, output transistor 8, etc. on the refueling machine OD side via the power supply line _L3 , and also serves as a voltage determination circuit 14.
is also connected. Reference numeral 13 denotes a power supply circuit that supplies a relatively high voltage (for example, 12V), which operates in response to each control signal d from the power supply control circuit 11 for a short period of time (than the period of the flow rate pulse P at the maximum oil supply flow rate). Give a voltage of 12V to the feeder L ₃ for a short period of time). As shown by the chain line, the control signal d may also be applied to the power supply circuit 12 so that the power supply circuit 12 is not supplied with power while the power supply circuit 13 is in operation.

Therefore, each time the flow rate pulse P is transmitted, the power supply line
The voltage of _L3 can repeatedly change from low to high (5V to 12V).

The voltage determination circuit 14 directly receives the flow rate pulse P from the flow rate pulse generator 4, and as long as the input of the flow rate pulse P and the voltage change are alternately performed,
The flow rate pulse P is sent to the counting circuit 5 of the refueling machine and the post terminal
It is determined that both of the counting circuits 10 of the POS are correctly counting, and no signal is output. However, when the above-mentioned state of alternating occurrence of the input of the flow rate pulse P and the voltage change on the power supply line _L3 breaks down (for example, there is no voltage change on the line _L3 and a plurality of flow rate pulses are input to the determination circuit 14 in succession) (or when the above voltage change occurs repeatedly after inputting one flow rate pulse as described later),
It is determined that an abnormality has occurred in the flow rate pulse transmission path, the counting circuit 10, and its related circuits, and the signal c is
is output and given to the motor control circuit 2 to stop the motor M. In addition to the above-mentioned purposes, the signal c can also be used via the line _L4 , for example, to control an on-off valve inserted in an oil feed path or as an operating signal for an alarm.

Count output signal corresponding to the input flow rate pulse number (oil supply amount) from the counting circuit 10 of the POS terminal POS
b' is sent via line _L5 to a suitable signal processing and recording device for processing the refueling information, such as billing and accounting.

When it is desired to forcibly stop the motor M of the refueling machine from the post terminal side, a plurality of signals corresponding to the count output signal b are continuously applied to the power supply control circuit 11 via the line _L6 , and the signal d is output, flow rate pulse P
The voltage change described above is repeatedly generated on the power supply line _L3 within one cycle, and the voltage judgment circuit 14 receives the signal c.
It is also possible to have it output.

FIG. 2 shows an example of the present invention implemented as a so-called preset oil supply system, and the same reference symbols as in FIG. 1 indicate corresponding circuits or components, and explanations thereof will be omitted unless necessary.

Reference numeral 15 designates a preset keyboard, and when a desired amount of refueling or amount of refueling is preset using this keyboard, the set value is stored in a preset circuit 16.

When the nozzle is removed from the nozzle case, a signal a generated by the nozzle detection switch causes the motor control circuit to cause the motor M to rotate at a low speed for an initial short period of time (for example, 2 seconds) and then at a constant speed to perform oil supply.

As the refueling progresses, the count value output signal b' (i.e., the refueling amount) from the counting circuit 10 changes to the preset circuit 1.
6 and compared with the preset value. If the count value (oil supply amount) is before the preset value (for example, 0.3
When the preset circuit 16 reaches the front), the preset circuit 16 outputs the signal e.
is outputted and given to the power supply control circuit 11 as a control signal f.
The power supply circuit 13 causes the power supply circuit 13 to stop supplying the 12V voltage to the line _L3 , and instead causes the power supply circuit 12 to supply a 5V voltage to the line _L3 .

The determination circuit 14 detects the voltage change (12V→5V) on this line _L3 , outputs a signal g, and sends it to the motor control circuit 2 to rotate the motor M at a low speed and perform lubrication at a small flow rate (speed). . When the count output (oil supply amount) of the counting circuit 10 reaches the preset value, the preset circuit 16 outputs a signal e' and supplies it to the power supply control circuit 11 to generate a control signal f', which controls the power supply 12.
(5V power supply) and stop supplying power to line _L3 . The voltage determination circuit detects this voltage change (5V→0V) and supplies a signal g' to the motor control circuit 2 to stop the motor M and complete the preset oil supply.

In the example of Figure 1, the voltage change on line _L3 is 5V
→12V, but it may be the other way around.

In the example of Figure 2, the voltage change on line L ₃ is 12V→
Although the voltage changes from 5V to 0V, the voltage may change from 5V to 12V to 0V by switching the positions of the power supplies 12 and 13.

It goes without saying that the photocouplers 7 and 9 and the output transistor 8 in FIGS. 1 and 2 are selected to be operable by the voltage of either one of the power supplies 12 and 13.

As described above, according to the present invention, a signal confirming the transmission of refueling information from the refueling machine to the POS terminal is transmitted from the POS terminal to the refueling machine. The control of the refueling machine can be ensured, and this confirmation signal can be sent from the refueling machine to the refueling machine with a simple circuit configuration using the existing transmission line connecting the refueling machine and the refueling machine. There is no need to add a special signal transmission line for this purpose.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram of an embodiment of the present invention;
The figure is a circuit configuration diagram of another embodiment. DESCRIPTION OF SYMBOLS 1... Nozzle detection switch, 2... Motor control circuit, 4... Pulse transmitter, 5, 10... Counting circuit, 6
...Display device, 7, 9... Photocoupler, 11... Power supply control circuit, 12, 13... Power supply circuit, 14... Voltage determination circuit.

Claims (1)

[Scope of Claims] 1. In order to transmit the flow rate pulse generated in the refueling machine according to the amount of refueling to a POS terminal separate from the refueling machine, the refueling machine and the POS terminal are connected to a power supply line and a pulse In the device connected by a transmission line, the POS terminal side includes a power supply circuit that selectively switches and applies voltages of different levels to the power supply line, and a power supply circuit that counts the flow rate pulses and outputs a count output signal for each input flow rate pulse. and a control circuit that operates in response to each of the counting output signals to generate a switching signal that switches the voltage of the power supply line to a different level and supplies it to the power supply circuit, and on the fueling machine side. , further comprising a voltage determination circuit that determines the presence or absence of an alternating state of the flow rate pulse and a change in the voltage level of the power supply line, and generates an output signal when the alternating state no longer exists. Refueling device. 2. A device in which the refueling machine and the POS terminal are connected through a power supply line and a pulse transmission line in order to transmit flow rate pulses generated in the refueling machine according to the amount of refueling to a POS terminal separate from the refueling machine. A power supply circuit that selectively switches and applies voltages of different levels to the power supply line on the POS terminal side, and a counting circuit that counts the flow rate pulses and generates a count output signal corresponding to the number of input flow rate pulses. and,
A preset circuit that presets the desired amount of oil supply;
Comparing the preset oil supply value and the count value of the flow rate pulse, and when the difference between the two values reaches a predetermined value or zero, a control signal is generated to switch the voltage of the power supply line and is applied to the power supply circuit. What is claimed is: 1. A refueling device, further comprising: a voltage determination circuit on the refueling machine side that generates a detection signal when detecting a change in the voltage level of the power supply line.